Bring 3 quarts of generously salted water to a boil in a large pot.
Once boiling, add uncooked pasta and stir into water. Cook to al dente, about 2-3 minutes shorter than the suggested time on the package.
While pasta is cooking, heat olive oil in a large sauté pan over medium heat.
Add garlic, crushed red pepper, and Mustard & Tarragon rub, stir to combine
Gently sauté garlic & spices until they begin to take on color, about 3 minutes.
Retrieve 1 cup of pasta water from the pot and pour half of it into the sauté pan, be careful, pan will give off a lot of steam and will bubble up when water is added.
When pasta is done, use tongs to remove the pasta from the pot and transfer directly to the sauté pan. Stir to coat with the garlic and oil mixture.
Add remaining 1/2 cup of pasta water, grated parmesan, butter, salt, and pepper.
Cook, stirring frequently until sauce has thickened and is glossy.
Finish with lemon zest, olive oil, and more grated parmesan. Serve immediately.
Enjoy!